Lathe for turning lasts.



STEPHEN J1 MCNCH''L, or? swig 'ro LYNN-Lasci*r COMPANY, or' LYcHofsE'rmsT4 To all u-/mm it mi/' y concern.'

jlic it knownthatfL S'rnPifIEN J. MC- Nu'ius'n;v a citizen ofthe UnitedStates of America` and ai'csidcnt ot'. Swampscott, i-n the county off[Gs-sexr a m-i' ,(`onnnonwea1th of Massacluisctts. have invented certain`new and usciulIin-prmeinents in Lathes for Iuruiiur Lasts. of`\`\fliirhthe' following is a s]wcification`- f L 'lille present invention relatesto Wood turning' machines 'and particularly" yto machincsfotthis'characterwhich are adapted to turn irregularshapcssuch as laststobe used in"thelmanufactureof bootsfand shoes.

vThe particularklijoct'ofthe'invention is to provide uica'nswhereinYdeepfliollows in' A furtherobjectf of' the inventioniis to provide a"cutterhead of small .size with cutting,r knives 'in different planeswith their outting' edges at"diti7eren'ti distances from the axis vot'said'heacl'whereby the work is suc-` cessi velv cnt f by,A :eacli of`the` knives [during the rotation-ofsa'id' head-j Y Another vobject ofytlifefim'ention is thel production of a cutterhead partji f 1 ilar1`yada' t'- ed for workvofthis-character 'and in which the knives may beqiiickyfre'moved for repair or sharpening'hntjiiwhieh said knives willbe securelyfheldduringthe'turning ope eration,` provision y'bein falso,made for `the adjustment rof kthe finishing,"knife.v

The invention Ififlrtlier [consists` `in rcertain novel features ofconstriu'tionfandfarrange-- ment of parts'IV which"A -will be 'fully,under-l drawings andjto y the` claims 'hereinafter given. i 1f' Of theldraw gsfzf Figuref .represents ae, front elevation "afsfhoe last.turning 4me#vv chine" "embodying tiife rin'ciples' of the presentinvention;f""`Fig. f represents a plan 0f a porton-riffthe macbnfshpwingthe fritti",T Mnlss'soosnms, esteriori onV oNEgTHiR'D NN; MAssAdHUsET-'sLi-CORPORATION .on Mns l LATHE lFon TURNING LAsTs".-

l Specification ofLett-ers Patent. l Patented API-.111 191 Applicationfiled June 1.y 1915. sensi No; 32,011

throughout the rseveral f ings.

known to `the trade asv -the model and work holding` meansgbu detailedked to* he adjusted towardv'and from -the machine on ing means 12x is a,small cut cured` th .o1-formed up'o'nt the usualrmanner. e'

tranelingframe, the revolubl'e cutter drurlng"mechanism,fand the`Wheel-adap y i to c 'oact ywith the inodel7 Fig; 3 represent section ofthe end ofthrvolubleslh cutter liead, and 4the bearing `forth 'latteFig; 4. represents a'transverse Sectio o` th saune! the cutting?`planebei'ng Iori 'i 1i on lfig'. vand 1*`ig.5 represents` s tiene detailof the opposite endof the cutte s if Similar characters designteffli .ip

figures ofth draw and The present invention isshown' tion with one\vel1`known-type' offgla ingr lathe5 but it wil-1' be' understoodinvention may be attached' Vvtof any well-known`lathesg The machineshown in i1" h frames 10 to the upper end of Lhic pivoted a swingingfrairiejfllfyeairyin means for holdingghv modell? and means 12*forhoiding` the `Work toH eratednpon;

Suitable means are providedy foi; i

are old,l it is deemed ,unneeessary'tof description herein. Y Themodell2 coaotsfwithapatternlwh Y 13 which' differs from t ose in` generaSe r only in thefact that it is ofsmnllerdizimete.

It is revolublymounted'on aslide 14y` all of' these parts and `the]operation"thera a ,e A ende luble shaft t 19 Vmounted torexolve ings"205-21 secured Etonpri'ghts 2 2 the 'frame 24 adaptedto'eciproatetudinaluly ofV the'machineonways, '17

l When itis desired'tonpplythe Aresen 1n yv'ention to a machine VAofftli*usua const le tion, the usual frame 24 isdivided and rating`members'-26 insertedfbetiveenth endv 27 'to 'giife thel irame24 greater lengthjthn the fralfnes lon machines of "this'e'hern te now in' general use. Thislengthening' of the frame 24 makes it possible to construct the shaft 19of greater length than the longestblock to be mounted on the workholding members 12x and to rotate said shaft 19 directly by means of apulley 28 secured to the end thereof opposite to that on which thecutter head 18 is secured.

Thepnlley 28 is driven by a belt 29 from the usual revoluble drum 30-found on all machines of this character. 1` he shaft 19 is inclinedrelatively to the front of the 1nachine with the pulley 28 further tothe rear than the cutter head 38, thereby providing sutlicient space topermit the rotation of the Werk without the latter conflicting with saidshaft during the .last turning operation.

The end of the shaft opposite the puiley 28 is provided with an enlargedconeshaped end 31, the'outer face of which has a radial recess 32therein." In the bearing 21 is mounted a revoluble member 33 having anenlarged end 34 abutting the inner face of the bearing 21. The innerface of this enlarged end 34 is provided with a radial recess 35.Interposed' between the opposed faces of the member 31 and the flangedhead 34 is an intermediate member 36 having ,radial recesses 37 and 38in opposite faces thereof, these recesses being perpendicular to eachother. The recesses 32, 37, 38 and 35 are disposed at right angles toeach other and prevented from movement relative to y each other by meansof a pin 39 disposed in the intermediate member 36 with its endsprojecting into the cone-shaped end of the haft 19 andthe flanged head34 as indicated in dotted lines in Fig. 3-of the drawings.

Disposed in therecess 32 is a cutting knife 4() and similarly disposed'in the recess 37 is a cutting knife 41. Inthe recess 38 is positionedthe cutting knife 42, while in the recess 35 is positioned the finishingcutter 43. It is apparent from an inspection of Fig. 3 of the drawingsthat these cutting knives A10, 4l, 42 and are all in different verticalplanes.l

. By an inspection of Fig. 4 of the drawings it will be noted that thecutting edge of the knife 41 is farther removed from the aXis ofthe'shaft lflthan the cutting edge of the knife 4() and the. cuttingedge of the knife 42 is farther removed from said axis than the cuttingedge ofthe' knife 4l, while the cutting edge of the finishing knife 43extends lstill farther outwardly.

in the .direction of the arrow a. on l? ig. 4 of the drawings thecutting knives 40, 4l, 42, and 43 will successively act upon the work indifferent planesgtb material in any one portion of the work beingremoved in 'four sections, a portion of the material first be ing cutaway by the knife 40 and then other By means of this. .construction asthe cutting head 18 rotates portions being successively cutl away by theVknives 41, 42, and 43.

The knife 43 is the finishing knife and has `a greater amount of cuttingedge as indicated at 44 in Figs. 2, 3, and 4 of the drawings. Each ofthe knives 40, 41, and 42 is provided at its inner end with acylindrical hole through which extends a clamping bolt 45 threaded tothe cone-shaped end of the shaft 19 as indicated at 46. By meansof thisbolt 45, the flanged head 34, the intermediate member 36, and theenlarged cone-shaped end of the shaft 19 are drawn together and theknives positioned in the various recesses of these members are securelyclamped in position. As the openings in the knives 40, 41, and 42 areCylindrical and fit the bolt 45, it is obvious that there cannot be anyend movement of these knives while on account of the clamping of theknives by means'of the bolt 45 there can be no lateral movement of theseknives and all chattering is preventedt The opening in the inner end ofthe .inishing knife 43' is elongated as shown 47 in Fig. 4 of thedrawings and threaded to the rear end of the knife 43 is a screw 48having a head 49 extending into a. groove 50. in the inner face of theflanged head 34, thereby preventing end movement of said screw as it isturned about its axis.

lt is obvious that'by turning the screw the knife 43 may be adjustedcndwise in either direction. The larger end'44 of the finishing knife 43overbalances the smaller ends of the other cutting knives and to obviatethis diiiculty a ring 51 is secured to the pcriphery of the flangedmember 34 by means of a` screw 52 or similar securing member.` T his'ring 51 is eccentric as shown in Fig. 4 with the greater thicknessdisposed opposite to the end 44 of the finishing knife 43. The ring 51also varies in width as shown in Fig. 2 of the drawings, thisyariationin width being for the purpose olf equally balancing the weight of theknives extending beyond the periphery of the eiitter head 'i8 so that inthe rotation ofthe shaft 1.) the entire cut ter head will be perfectlybalanced. The shaft 19 at omil ond is provided with the annular grooveo3 into which extends a plate 54 secured to lthe yend of the bearing 20asindicated in Figs. 2 and 5 ofthe drawings.

The ring 51 is provided with an opening therein opposite the screw 48through which a screw driver may be inserted to turn the screw 48 andadjust the knife 43 as desired. By means of this construction a cutterhead of greatly reduced diameter may be used and thereby turn lasts withthin combs, the hollowingout on opposite sides of the com-b beingentirely accomplished by. means of a machine and dispensing with handlabor.

It is believed that the operation and many mmlcl 511ml 1 uluble sha on::l flat l'ovoluble slmf suppol a on andY having member: mld shzff lpreventinghe :gte und lla'n In :l i

ext-ening through said flanged and nter- Signed by me at Bston, Mass.,this 25th mediate members and said knives and day of May,1915.

threaded in the end of said shaft; means STEPHEN J. MCNIGHOL. 'forpreventing endwise movement of said `Wimesses: 5 revulube shaft in itsbearing; :md a wheel WALTER E. LOMBARD, for engngng th? model. N(AT1XANC. LOMBARD.

